Dagger lifter for looms



April 11, 1939. B. H. B RIDGMAN DAGGER LIFTER FOR LOOMS Filed Dec. 1'7,1937 BOYD H. Bra/06mm 3 wuc wfom Patented Apr. 11,1939

- UNITED STATES PATENT OFFICE DAGGER LIFTER FOR- LOOMS Boyd H. Bridgman,Spartanburg, S. C. Application December 1'7, 1937, Serial No. 180,398

1 Claim.

' This invention relates to an improved dagger lifter, which isparticularly adapted for use on high speed looms where it is necessaryto release the pressure on the back binder in the shuttle box so thatthe shuttle may be expelled from a loose box and received into a loosebox on the opposite end of the lay. The dagger lifter herein describedis an improvement in the structure shown and described in Letters PatentNo. 2,093,226, issued September 14, 1937.

In high-speed looms when weaving in the neighborhood of one hundred andeighty to two hundred picks or over per minute, there must be a highpressure exerted upon the back binder of the shuttle boxes and theshuttles in order to effectively actuate the protection dagger. Unlessthis pressure is exerted, the protection dagger will not act quicklyenough to cause the loom to be stopped in case of an improperly boxedshuttle or by an empty shuttle box during the beating up or forwardstroke of the lay. As stated in Patent No. 2,093,226 it is desirable tohave a loose shuttle box from which the shuttle is expelled and a loosebox for receiving the shuttle. This looseness within the box may beaccomplished by raising the dagger at the proper time and thus relievingthe pressure upon the back binder.

It is, therefore, an object of this invention to provide a dagger lifterwhich is adjustably secured to the frame of the loom, said lifterprojecting upwardly and beneath the dagger to cause said dagger to beraised when a loose shuttle box is desired. By adjustably securing thelifter to the frame of the loom, it may be adjusted independently of thefrog member, therefore, the time of raising the dagger to provide aloose box may be delayed or advanced as desired.

Some of the objects of the invention having been stated, other objectswill appear as the description proceeds, when taken in connection withthe accompanying drawing, in which:

Figure l is a transverse sectional view through the lay of a loomshowing my invention applied thereto;

Figure 2 is a plan view taken along the line 2-2 in Figure 1;

Figure 3 is an elevation of a portion of the loom lay and taken alongline 3-3 in Figure 1;

Figure 4 is an isometric view showing my improved lifter apart from theloom.

Referring more specifically to the drawing, the numeral l0 denotes thelay of a loom which has the shuttle box mounted at each end on the upperside thereof comprising a box front l2 and a back binder l3, betweenwhich a shuttle I4 is adapted to move when the shuttle is in a boxedposition. The back binder I3 is pivoted as in a conventional manner asshown in Patent No. 2,093,226 and is adapted to furnish the necessaryguidance for the shuttle as it enters the box. Suitable checking means,not shown, are provided for checking the shuttle when it is positionedin the shuttle box. This checking'means may be of the type shown in saidpatent.

As heretofore stated, it is very desirable in high-speed looms that theshuttle be allowed to enter a loose box, but immediately upon its entrythe pressure of the binder l3 must be applied to assist the checkingmeans to check the velocity. Also when it leaves the box, this pressuremust be released from the back binder so that a quick getaway may beobtained. This pressure is applied, or released, by means of a suitablearm [6 which has its lower end secured to one end of a suitableprotection rod l1, said rod extending transversely of the loom and beingpivotally mounted in suitable brackets, such as IB. A torsion spring l9normally holds the upper end of arm [6 against back binder l3.

Also mounted on protection rod I1 is a dagger 20, which moves back andforth along the lay as it oscillates from the bold line position to thedotted line position as shown in Figure 1. If, for any reason, theshuttle is not properly boxed, then the arm l6, whose upper end isnormally forced against the binder l3 by spring l9, will cause theleft-hand end of the dagger 20 to rotate in a counter-clockwise mannerand upon the movement of the lay to the left in Figure 1, the lower endof the dagger will contact steel member 2|, and causethe frog member 22to be moved to the left.

This frog member is slidably mounted on the frame 23 of the loom and isnormally forced to the right and against a stop- 2! by means of asuitable compression spring 25. Upon the contact of dagger 20 with thefrog steel 2|, the frog 22 will also move arm 2'! to the left and causethis arm to operate the lower end of knock-off lever 28 which in turnwill stop the loom.

The parts thus far described are conventional, but it is deemednecessary to disclose this much of the old structure in order to moreeffectively explain the purpose of my invention. As heretofore stated,when the lay is in a rearward or dotted line position, it is desirablethat the pressure upon the back binder be relieved so that an incomingor an outgoing shuttle may have a loose box from which to enter or toleave.

This pressure is relieved by providing a suitable dagger lifter 30 whichhas a base portion 3|, said portion being secured to the loom frame 23by any suitable means, such as bolt 32. The bolt 32 penetrates the slot30a in the lifter and slot 24a in the stop member 24 and the loom frame23. The lifter has an upstanding arm 30?) integral therewith, said armbeing adapted to project over the top of frog 22. The position that thisoverhanging portion 30b occupies relative to the frame of the loomdetermines the time at which the dagger 20 is raised to cause thepressure to be relieved from the back binder I3. Therefore, the slot30a. is provided so that a certain amount of latitude may be had in theadjustment. Since both the stop member 24 and the lifter 30are securedto the frame 23 by bolt 32, it is evident that when the bolt is loosenedto adjust one of the members, that the other may be adjusted also.

It is, therefore, seen that I have provided a dagger lifter which isadjustably mounted relative to the frame of the loom, and which isindependent of the frog member.

In the drawing and specification there has been set forth a preferredembodiment of the inven tion, and although specific terms are employed,

they are used in a generic and descriptive sense only, and not forpurposes of limitation, the scope of the invention being set forth inthe appended claim.

I claim:

In a loom provided with an oscillating lay and having a shuttle box oneach end of the lay, each shuttle box being provided with a movablebinder, said lay being provided with a protection rod provided with adagger, said loom having a frog adapted to be engaged by the dagger inthe absence of a shuttle in a shuttle box for stopping the loom, saidprotection rod having an upstanding arm engaging the binder and atorsion spring on the protection rod for applying pressure to said armfor exerting pressure on the binder, means for relieving pressure ofsaid torsion spring on said binder at a. certain point in theoscillation of the lay, comprising a member mounted on the loom framefor adjustment relative to the frog and extending over a portion of thefrog to engage the dagger and raise the same while a shuttle is beingexpelled from a shuttle box in one end of the lay and being received inthe shuttle box in the other end of the lay.

BOYD H. BRIDGMAN.

